Blake Eggleston created CASSANDRA-14517:
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Summary: Short read protection can cause partial updates to be read
Key: CASSANDRA-14517
URL: https://issues.apache.org/jira/browse/CASSANDRA-14517
Project: Cassandra
Issue Type: Bug
Reporter: Blake Eggleston
If a read is performed in two parts due to short read protection, and the data
being read is written to between reads, the coordinator will return a partial
update. Specifically, this will occur if a single partition batch updates
clustering values on both sides of the SRP break, or if a range tombstone is
written that deletes data on both sides of the break. At the coordinator level,
this breaks the expectation that updates to a partition are atomic, and that
you can’t see partial updates.
In some cases, read repair can make this partial update permanent. If a write
hits a single node, but fails to reach the other replicas, part of it is
returned via SRP and read repaired to the rest of the replicas, then the single
node with then full write fails before repair or read repair, the partial write
will become permanent.
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